Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 1 | #ifndef _NF_NAT_H |
| 2 | #define _NF_NAT_H |
| 3 | #include <linux/netfilter_ipv4.h> |
Patrick McHardy | cbc9f2f | 2011-12-23 13:59:49 +0100 | [diff] [blame] | 4 | #include <linux/netfilter/nf_nat.h> |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 5 | #include <net/netfilter/nf_conntrack_tuple.h> |
| 6 | |
Eric Dumazet | fd2c3ef | 2009-11-03 03:26:03 +0000 | [diff] [blame] | 7 | enum nf_nat_manip_type { |
Patrick McHardy | cbc9f2f | 2011-12-23 13:59:49 +0100 | [diff] [blame] | 8 | NF_NAT_MANIP_SRC, |
| 9 | NF_NAT_MANIP_DST |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 10 | }; |
| 11 | |
| 12 | /* SRC manip occurs POST_ROUTING or LOCAL_IN */ |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 13 | #define HOOK2MANIP(hooknum) ((hooknum) != NF_INET_POST_ROUTING && \ |
| 14 | (hooknum) != NF_INET_LOCAL_IN) |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 15 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 16 | /* NAT sequence number modifications */ |
| 17 | struct nf_nat_seq { |
| 18 | /* position of the last TCP sequence number modification (if any) */ |
| 19 | u_int32_t correction_pos; |
| 20 | |
| 21 | /* sequence number offset before and after last modification */ |
| 22 | int16_t offset_before, offset_after; |
| 23 | }; |
| 24 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 25 | #include <linux/list.h> |
Yasuyuki Kozakai | 4ba8877 | 2007-07-07 22:22:33 -0700 | [diff] [blame] | 26 | #include <linux/netfilter/nf_conntrack_pptp.h> |
Yasuyuki Kozakai | 2d59e5c | 2007-07-07 22:24:28 -0700 | [diff] [blame] | 27 | #include <net/netfilter/nf_conntrack_extend.h> |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 28 | |
Yasuyuki Kozakai | 4ba8877 | 2007-07-07 22:22:33 -0700 | [diff] [blame] | 29 | /* per conntrack: nat application helper private data */ |
Eric Dumazet | fd2c3ef | 2009-11-03 03:26:03 +0000 | [diff] [blame] | 30 | union nf_conntrack_nat_help { |
Yasuyuki Kozakai | 4ba8877 | 2007-07-07 22:22:33 -0700 | [diff] [blame] | 31 | /* insert nat helper private data here */ |
Changli Gao | 03c0e5b | 2010-11-15 12:27:27 +0100 | [diff] [blame] | 32 | #if defined(CONFIG_NF_NAT_PPTP) || defined(CONFIG_NF_NAT_PPTP_MODULE) |
Yasuyuki Kozakai | 4ba8877 | 2007-07-07 22:22:33 -0700 | [diff] [blame] | 33 | struct nf_nat_pptp nat_pptp_info; |
Changli Gao | 03c0e5b | 2010-11-15 12:27:27 +0100 | [diff] [blame] | 34 | #endif |
Yasuyuki Kozakai | 4ba8877 | 2007-07-07 22:22:33 -0700 | [diff] [blame] | 35 | }; |
| 36 | |
Yasuyuki Kozakai | b6b84d4 | 2007-07-07 22:26:35 -0700 | [diff] [blame] | 37 | struct nf_conn; |
| 38 | |
| 39 | /* The structure embedded in the conntrack structure. */ |
Eric Dumazet | fd2c3ef | 2009-11-03 03:26:03 +0000 | [diff] [blame] | 40 | struct nf_conn_nat { |
Patrick McHardy | 53aba59 | 2007-07-07 22:30:27 -0700 | [diff] [blame] | 41 | struct hlist_node bysource; |
Yasuyuki Kozakai | b6b84d4 | 2007-07-07 22:26:35 -0700 | [diff] [blame] | 42 | struct nf_nat_seq seq[IP_CT_DIR_MAX]; |
| 43 | struct nf_conn *ct; |
Yasuyuki Kozakai | 4ba8877 | 2007-07-07 22:22:33 -0700 | [diff] [blame] | 44 | union nf_conntrack_nat_help help; |
| 45 | #if defined(CONFIG_IP_NF_TARGET_MASQUERADE) || \ |
| 46 | defined(CONFIG_IP_NF_TARGET_MASQUERADE_MODULE) |
| 47 | int masq_index; |
| 48 | #endif |
| 49 | }; |
| 50 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 51 | /* Set up the info structure to map into this range. */ |
| 52 | extern unsigned int nf_nat_setup_info(struct nf_conn *ct, |
Patrick McHardy | cbc9f2f | 2011-12-23 13:59:49 +0100 | [diff] [blame] | 53 | const struct nf_nat_ipv4_range *range, |
Patrick McHardy | cc01dcb | 2007-12-17 22:38:20 -0800 | [diff] [blame] | 54 | enum nf_nat_manip_type maniptype); |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 55 | |
| 56 | /* Is this tuple already taken? (not by us)*/ |
| 57 | extern int nf_nat_used_tuple(const struct nf_conntrack_tuple *tuple, |
| 58 | const struct nf_conn *ignored_conntrack); |
| 59 | |
Yasuyuki Kozakai | 2d59e5c | 2007-07-07 22:24:28 -0700 | [diff] [blame] | 60 | static inline struct nf_conn_nat *nfct_nat(const struct nf_conn *ct) |
| 61 | { |
Changli Gao | e0e76c8 | 2010-11-15 12:23:24 +0100 | [diff] [blame] | 62 | #if defined(CONFIG_NF_NAT) || defined(CONFIG_NF_NAT_MODULE) |
Yasuyuki Kozakai | 2d59e5c | 2007-07-07 22:24:28 -0700 | [diff] [blame] | 63 | return nf_ct_ext_find(ct, NF_CT_EXT_NAT); |
Changli Gao | e0e76c8 | 2010-11-15 12:23:24 +0100 | [diff] [blame] | 64 | #else |
| 65 | return NULL; |
| 66 | #endif |
Yasuyuki Kozakai | 2d59e5c | 2007-07-07 22:24:28 -0700 | [diff] [blame] | 67 | } |
| 68 | |
Jozsef Kadlecsik | 5b1158e | 2006-12-02 22:07:13 -0800 | [diff] [blame] | 69 | #endif |